Daikin REYQ96MTJU, Design, Installation & Testing Instruction, Page: 113 / 236

Si39-406 Appendix
General Information 107
7.5 How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged R (lb.)
R should be rounded off in units of 0.1lb..
Note: If a negative result is gotten for R from the formula at right, no refrigerant needs to be added.
*Example for refrigerant branch using refnet joint and refnet header
Note: The amount of refrigerant to be added to the unit should be written on the included "Added
Refrigerant" plate and attached to the rear side of the front cover. Refer next page.
*Example for refrigerant branch using refnet joint and refnet header
R= + +
Total length (ft.)
of liquid piping
size at
φ
1/2”






×0.074
Total length (ft.)
of liquid piping
size at
φ
1/4”






×0.015
Total length (ft.)
of liquid piping
size at
φ
3/8”






×0.036
1 2 3 4
B2 B1 B3 B4
5 6 7
7 6
1 6
8
H2
H1
a
b
c
l
n
o q
r s
p
m
k i
f
g
j h
d e
REFNET joint ( ~ ) Outdoor unit
BS unit
Indoor unit
B1 B4
Cooling only
( . )
Cool/Heat selection possible ( ~ )
( ~ )
1
( ~ )
8
A B
C D E
A
E
a:
φ
3/8 × 100ft.
b:
φ
3/8 × 30ft.
c:
φ
1/4 × 30ft.
d:
φ
1/4 × 30ft.
e:
φ
1/4 × 30ft.
f :
φ
1/4 × 30ft.
g:
φ
1/4 × 30ft.
h:
φ
1/4 × 70ft.
i :
φ
3/8 × 30ft.
j :
φ
1/4 × 30ft.
k:
φ
1/4 × 25ft.
If the piping lengths
are as at right
R= a+b+i × 0.036 + c+d+e+f+g+h+j+k × 0.015 × 1.15 = 11.37 11.4
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